Mechanical testing of cancellous bone (Bio-mechanics) Essay

Mechanical testing of cancellous bone (Bio-mechanics) - Essay Example Along these lines, the plotting of pressure bends was finished. Basing on the catch and the incline of the diagram acquired in this examination, compressive quality, the firmness, the zero strain point, just as the disappointment strain were then determined. It was discovered that thickness was in legitimately extent with the three mechanical properties (solidness, quality, and disappointment strain) for tests from porcine, just as cow-like bone. Following these outcomes, it was finished up in this manner, that the mechanical conduct of malignant bone in both pig and the cow is practically comparative in spite of the fact that it was to some degree lower in the bovine examples comparative with that from porcine. Trabecular bone or the carcinogenic bone is the permeable material that frequently speak to a sort of bony tissue shaping bones (Jee, 1996). Exploration demonstrates that trabecular bone has a higher surface region comparative with different kinds of bony tissues (Foss, 1992). Opposite, it has been found to have less thickness and firmness (Currey, 1987). Ostensibly, the dangerous bone mechanical conduct is to some degree like the other related cell materials including the polymeric. This is a direct result of its having a cell structure comprising of the associated system of plates and poles (Bursten, and Frankel, 1999). There are contributing elements to the harmful bone quality with bone thickness distinguished as one such factor. As indicated by WHO (1994) there is have to decide the break dangers utilizing bone mineral thickness. It is likewise significant that other than the thickness of the bone, testing conditions, just as the types of the creature are fundamental elements in fluencing the solidness and quality of harmful bones (Bell, Olive and Grabb, 1988). From the investigated collection of writing, it is obvious that there are various examinations that have been directed with a perspective on assessing the thickness, and quality of a bone. Be that as it may, there are restricted exploration directed on ward of the quality of the destructive bone on either

The Mississippi River essays

The Mississippi River articles The Mississippi River is one of the world's extraordinary waterways. It is the longest waterway in the United States, more than twenty-300 miles in length, as it shapes the fringes of ten states, nearly bisecting the landmass (Currie,2003, 8). The waterway has a long history too, and it has contacted the lives of numerous individuals. The Mississippi is said to start at Lake Itasca in Minnesota. In 1832, voyager Henry Schoolcraft named this lake, not after any neighborhood Indian name, yet from the Latin words for valid head which are veritas caput abbreviated to Itasca (Currie, 2003, 4). Be that as it may, some time before its source was named it was a navigational stream. The Indians who originally lived on the banks of the waterway were known as the Mississippians. From 800 to 1500, these people groups utilized the stream for exchange. They burrowed out logs to make kayaks. Their general public flourished somewhere in the range of 100 and 1300, and afterward for no good reason went into decay. The Chickasaw and Yaddo people groups came straightaway. They lived around the Lower Mississippi and furthermore utilized hole kayaks to explore the damp landscape. T(ey were firmly associated with the waterway, since it was the absolute best approach to travel. Northern clans were marginally less bound to the stream since they lived in a zone of progressively strong ground. They were bound to make light birch bark secured kayaks for utilization of the waterway (Currie, 2003, 30-33). In 1519, Alonso Alvarez de Pineda, a Spanish guide, turned into the first European to cruise on the Mississippi River. He cruised his three boats around twenty miles up the mouth of the Mississippi from the Gulf of Mexico and afterward convoluted and backpedaled on his approach to Mexico. The following recorded European experience with the waterway was on May 21, 1541 when Hernando de Soto, another Spaniard, went over the stream around the territory of Memphis, Tennessee with his military during their investigations for gold. They were worn out and saw ... <!

Sports Psychology Career Overview

Sports Psychology Career Overview Student Resources Careers Print Sports Psychology Career Overview By Kendra Cherry facebook twitter Kendra Cherry, MS, is an author, educational consultant, and speaker focused on helping students learn about psychology. Learn about our editorial policy Kendra Cherry Updated on January 23, 2020 Buero Monaco / DigitalVision / Getty Images More in Student Resources Careers APA Style and Writing Study Guides and Tips According to Division 47 of the American Psychological Association, sports psychology encompasses a range of topics including motivation to persist and achieve, psychological considerations in sport injury and rehabilitation, counseling techniques with athletes, assessing talent, exercise adherence and well-being, self-perceptions related to achieving, expertise in sport, youth sport and performance enhancement and self-regulation techniques. While popular perceptions often presume that sports psychology is only concerned with professional athletics, this specialty area includes a broad range of scientific, clinical and applied topics involving sports and exercise. There are two key areas of interest in sports psychology: understanding how psychology can be applied to improve motivation and performance and understanding how sports and athletics can improve mental health and overall well-being. Sports psychologists may also choose to specialize in a particular area. Some examples of major specialties within this field include: Applied sports psychology focuses on teaching skills to enhance athletic performance such as goal setting and imagery.Clinical sports psychology involves combining mental training strategies from sports psychology with psychotherapy to help clients who suffer from mental health problems including eating disorders and depression.Academic sports psychologists teach at colleges and universities and also conduct research What Sports Psychologists Do Sports psychologists typically perform a range of tasks related to sports performance and education. Some opt to teach at the university level, while others work directly with athletes to increase motivation and enhance performance. Other options include client counseling, scientific research and athletic consulting. In addition to working with professional athletes, sports psychologists also utilize their expertise to increase the mental well-being of non-athletes. They may work with a range of clients including children and teens involved in athletics, professional athletes and teams interested in improving their performance and injured athletes working toward returning to competition. Salary Pay ranges vary considerably within sports psychology based on training, education, and area of specialization. According to the Occupational Outlook Handbook published by the U.S. Department of Labor, average salaries for clinical and counseling psychologists  range between $41,850 and $71,880. The median salary for university faculty positions was $55,000 in a 2001 salary survey by the American Psychological Association (APA) (Singleton et al., 2003). Some top sports psychologists earn six-figure salaries working as consultants for professional athletes, but most earn a more modest yearly income. Educational Requirements Entry-level positions with a bachelors degree are rare, usually taking the form of internships. Most positions require a masters or doctorate degree in clinical, counseling or sports psychology as well as direct training and experience in apply psychology to sports and exercise. The American Board of Sport Psychology offers a few different professional certifications. The highest level credential is the Board Certified Sports Psychologist-Diplomat, which ...signifies that the holder has advanced training and experience in Sport Psychology and is especially aware of ethical, methodological, and research issues associated with the application of methods to enhance the psychological performance of athletes. Many who hold this certification are also certified or licensed clinical, counseling or health psychologists. Because there are few graduate programs offering specialized degrees in sports psychology, it can be difficult to determine what exact combination of training and experience qualifies a professional to be called a sports psychologist. Division 47 of the APA suggests that sports psychologists should be licensed psychologists with experience in applying psychological principles in sports settings. Additionally, extensive educational background and training in sports, motivation management, performance, and athletics are also recommended. Is a Career in Sports Psychology Right for You? Only you can decide if a sports psychology career is suited to your needs, interests, talents, and goals. If you dislike sports or exercise, this career is probably not for you. But if you enjoy helping people achieve their full potential, solving complex problems and working as part of a team, this field might be an ideal match for you. Pros and Cons Like all careers, sports psychology has its advantages and disadvantages. Before you decide if this career is right for you, spend some time learning more about sports psychology. Explore your options by taking an introductory course on the subject and weigh your choices carefully before you decide. Benefits of a Career in Sports Psychology Sports psychologists often work as part of a collaborative team.There are diverse career paths and specialization opportunities (i.e. teaching, youth sports, professional athletics training).It can be a fun, challenging and exciting job. Downsides of a Career in Sports Psychology The emphasis on teamwork may be difficult for independent-minded individuals.Requires extensive education, training, and experience.Opportunities are generally more limited for bachelors and masters degree-holders. Suggested Resources The American Board of Sport PsychologyAPA Division 47 - Exercise and Sports PsychologyThe Journal of Applied Sport PsychologySachs, M.L., Burke, K.L., Schrader, D.C. (2000) Directory of graduate programs in applied sport psychology (6th ed.). Morgantown, WV: Fitness Information Technology.

Informative Speech Essay - 843 Words

Aaron Igel Professor Doyle Intro to Comm. T R 8:30 a.m. – 9:45 a.m. 01 October 2014 Drums What is the absolute best sound in the world? Is it the crashing of waves, the sound of a V8 hemi, or the sound of a credit card being swiped and approved? For a musician, in particular a percussionist, the sound of a drum set would be their favorite sound in the world. Today I am going to briefly talk about the origin of the drum, the components of the modern drum set, and the benefits of drumming. I) Percussion instruments have been used since prehistoric times. A) Drums are found in nearly every culture in the world and have existed since before 6000 B.C. (â€Å"drum.†). 1) The first drumming in drums history was a series clapping of hands and†¦show more content†¦(â€Å"How Products are Made.†) b) Hardware made of steel to hold everything together, some use plastic and wood for rims and stands. Snare strands also made of steel. 2) Cymbals, sticks, and heads a) Cymbals normally made of an alloy of copper, tin, and low amount of silver. (hihat, crash, ride) b) Sticks usually hickory, oak, and maple: plastic/wood tips. c) Heads made up of polyethylene terephthalate. Come in coated, smooth coated, ebony, clear, and skins. (â€Å"How Products are Made.†) A) Todays modern components of the Drumset 1.) 5 piece drumset-general starter kit. a) Snare drum: mounted on a special stand, placed between the players knees. Contain steel strands underneath it which produce its unique sound. b) One or more tom toms drums, (high pitched short drums), mounted on raised stands without snares underneath them like the snare drum. c) A hi-hat stand(set of 2 cymb.) , operated by the left foot. Also, one or more suspended cymbals are used (normally crash, ride). All the drums and cymbals are hit using a drumstick, w/ the exception of the bass drum d) Bass drum: Played by a pedal operated by the right foot. Low end, Deep, punchy sound. e) The drumset is usually played seated on a drum stool or throne. -- The most important factor in the quality control ofShow MoreRelatedInformative Speech Essay855 Words   |  4 Pagestype of speech would the speaker choose. Well chapter 13 contents the creative process for informative speaking. What informative speaking is how to choose a focused informative topic, how to conduct a research and informative outline? The chapter also contains how to organize the body, introduction, and conclusion of the informative speech. Lastly chapter 13 contents explain how to prepare to present the speech and evaluate and informative speech. In order to make a well informative speech the speakerRead MoreInformative Speech912 Words   |  4 Pagesï » ¿Informative Speech: The Causes of Homelessness Subject and Purpose 1. This informative speech on â€Å"The Cause of Homelessness â€Å"is very Inform able and worth listening to, because in today’s economy it could be you or me. Some seem to think homelessness is choice. I find this speech relevant to the world I live in today, due to the high unemployment rate, declining job market, and the economic hardships that families are enduring. This topic is not a broad one, but yet can be spokeRead MoreInformative Speech793 Words   |  4 PagesA List of Informative Speech Topics: Pick Only Awesome Ideas! Just when you thing youre way past through the question How to write an essay?, another one comes. Thats the thing students desperately Google like What is a informative speech? – and, believe experts, this is something youll definitely need some professional help in. Informative speaking is a speech on completely new issue. Tell your audience something they have never known! Now that you know the answer to the question â€Å"WhatRead MoreInformative Speech1497 Words   |  6 Pagesï » ¿ORGC 201 Informative Speech Assignment Create a 5-6 minute presentation using PowerPoint visuals. Make sure your PowerPoint follows the guidelines discussed in class. The purpose of the presentation should be to inform the audience. Your presentation should reflect a topic, theme, or issue relevant to your major. For ideas of topics, you may consider looking at issues of Crains’ Chicago, The Wall Street Journal, Bloomberg BusinessWeek, The New York Times, The Chicago Tribune, cnn.com, TheRead MoreInformative Speech1451 Words   |  6 PagesInformative Speech Title: Child Care General Purpose: To inform Specific purpose: I want my audience to be informed of child care facilities Central purpose: I want my audience to be aware that they can save money I. Introduction Six months ago, corporate daycare facilities were cleaning out my bank account. I was losing the ability to pay for gas, rent and my utilities because all my money was going towards my son’s weekly daycare tuition. My parents could help me scrap on by here and thereRead MoreInformative Speech978 Words   |  4 PagesInformative Speech: How to Decide on a College Major Benjamin Ownby I. Introduction A. According to the National Center for Education Statistics in a 2013 study, college students changed their major an average of three times. B. Trying to determine a college major is difficult for us. C. Last Spring, I was struggling to decide whether I should continue pursuing a degree in Civil Engineering or change majors to MIS, an interesting major I had recently discovered. I continued to have trouble makingRead Moreinformative Speech758 Words   |  4 Pagesï » ¿Informative Speech with Visual Aids Outline Specific Purpose: To inform my audience about extreme beauty practices in different cultures. INTRODUCTION I. I am pretty sure most of you here have heard the old saying that â€Å"Beauty is Pain.† II. We wake up striving to look better or beautiful everyday more and more. III. That is because as human beings we tend to be very visual and observe the look of a person before finding out who they really are. IV. So, today I will be sharing with you aRead MoreInformative Speech981 Words   |  4 PagesINFORMATIVE SPEECH (David Hurt, COM 108) Low Pay for Women Compared to Men in America How much did you pay for your car? Did you know that the difference between an average man and women’s salary is enough to purchases a new automobile in America. Below I’m going to discuss the pay gaps, Educational aspects with men and women, and why this issue is world wide. In order to better understand this issue of pay between men and women look at your wife’s or husband’s pay and you’ll see theRead MoreInformative Speech1145 Words   |  5 Pagesï » ¿Cheyenne Duran Comm 20 Kelly Glass October 23, 2013 Informative Speech Outline Topic: Gun Control Organizational pattern: Topical Specific purpose: To inform my audience about the controversial subject gun control. Primary audience outcome: I want my audience to know the two sides on the topic of gun control. Thesis statement: Gun control will create laws and licensing to possess a gun to help decrease crime and fatalities, but also people believe gun control is going against our constitutionalRead Moreinformative speech1255 Words   |  6 Pagesï » ¿ Title: Information Speech Outline â€Å"The Evolution of Animation† Subject Code: USEL 23 - Speech Communication Prepared For: Datin Minda Hassan Prepared By: Nur Rabiatul Adawiyah Bt Mohd Nor Kamarudin (1411170007) Class: Oregon Program: ADFP Summer 2014 Preparation Outline Informative Speech â€Å"The Evolution of Animation – From 2D Animation to 3D Animation† General Purpose: To inform Specific Purpose: To inform my audience the evolution of animation. Central

The Old Man and the Sea by Ernest Hemingway - 1734 Words

Ernest Hemingway was a man among men. He painted his life through written words. In his life Hemingway experienced events that would change him and shape the man that he was. Hemingway wrote about his time he spent in World War I in his first novel, The Sun Also Rises, and in his last novel, The Old Man and the Sea, he writes about his fishing exploits, both of which Hemingway experienced himself. By comparing these two works that he has written, a reader can perceive his linguistic style and the reflection on himself through the protagonists in the stories. Hemingway is among the great American writers. He served his time in World War I and was always his best character. Hemingway became a celebrity and a legend in his lifetime. The amount of drama in his love-life seemed to overshadow the great quality of the work that he produced. Hemingway can also be considered a literary scholar, a reader and writer of many books. People might not realize this because of all the safari trips, the fishing, bull-fighting, and the war, that he took part in. His first novel, The Sun also Rises, was written in 1926, when Hemingway was in Paris after World War I. Like all writers, there are some that influence others. The ancient author of the Aeneid, Virgil was influenced by Homer, the author of the Odyssey and the Iliad. All three stories share some of the same places, characters, and some history of the great city of Troy. But one tells it in more detail or in a different perspectiveShow MoreRelatedThe Old Man And The Sea By Ernest Hemingway1599 Words   |  7 PagesNew York, NY USA 10027 Dear Pulitzer Prize Judging Board: The Old Man and the Sea by American author, Ernest Hemingway deserved the Pulitzer Prize it received because of the author s use of craft elements, the realness of all of the characters and events, and the lasting themes that are relevant to the year it was written that were created by this realness, which in turn created a legacy. The first reason The Old Man and the Sea deserved its Pulitzer Prize is because of the author’s use of craftRead MoreThe Old Man And The Sea By Ernest Hemingway1744 Words   |  7 Pagesâ€Å"The Old Man and The Sea† by Ernest Hemingway is a story about an old man named Santiago who has to overcome many obstacles in his time at sea and in life (Hemingway). Despite being a fisherman, Santiago has not caught fish in 84 days and is faced by numerous dilemmas and shortcomings as things seem to always go wrong for him (Hemingway). This paper provides an analysis of the novel by interpreting it as a secular humanist epic. This paper hypothesizes that the character of Santiago is guided byRead MoreThe Old Man And The Sea By Ernest Hemingway1952 Words   |  8 Pagesinternal conflicts; there are many internal and external conflicts in the novella. One of the main conflicts is that Santiago couldn’t catch the marlin. This is resolved by Santiago eventually catching the fish three days after he returned back to sea after he had an eighty four day unsuccessful streak; this solution is believable because he was determined to catch the fish which he did. A secondary conflict in this novella was that Santiago began to talk to himself because Manolin is no longer withRead MoreThe Old Man And The Sea By Ernest Hemingway2056 Words   |  9 Pagesâ€Å"The Old Man and The Sea† by Ernest Hemingway Plot Summary: â€Å"The Old Man and The Sea† relates the difficult life of an old Cuban fisherman that struggles in his profession for a long period of time until he catches the biggest fish in his life. The story begins presenting readers the fact that Santiago, the old fisherman, has been eighty-four days without catching a fish. This uncomfortable situation leads Manolin, a teenager who works with Santiago, to leave him under his father’s command.Read MoreThe Old Man and the Sea by Ernest Hemingway Essay589 Words   |  3 PagesThe Old Man and the Sea by Ernest Hemingway After reading this novel, The Old Man and the Sea, by Ernest Hemingway, I was confused about something the old man kept repeating. During the course of the book, the old man, Santiago, refers to having gone out to far to catch the fish. To me, this sounds as though he is making excuses for himself as to why he could not bring the fish in. On the other hand, he may have realized that he should not have gone out so far because it was not worth it forRead MoreAn Old Fisherman in The Old Man and the Sea by Ernest Hemingway939 Words   |  4 Pages On July 21, 1899, Ernest Hemingway was born to Grace Hall-Hemingway and Clarence Edmonds Hemingway in Oak Park, Illinois. He started off his writing career in high school, when he was writing sports articles for the high school newspaper. From there, he moved on to writing for the Kansas City Star, where he learned to write in his unique short sentences, declarative, writing style. From journalism, Hemingway moved on to the military life an d met a nurse in Milan that was his inspiration for â€Å"ARead MoreErnest Hemingway s A Old Man And The Sea1588 Words   |  7 PagesErnest Hemingway, an Intense Macho Bullfighting Woodsman of an author, If you met him in person you would not beleive him when he told you he s an author. However Ernest Hemingway is a very accomplished author, well known as the Chronicler of the lost generation, and for his Pulitzer Prize winning Old Man and the Sea. Hemingway also was known for his collection of short stories, like In Another Country and The Snows of Kilimanjaro, as with many of his stories these two are set in 2 places he hasRead MoreErnest Hemingway s The Old Man And The Sea942 Words   |  4 PagesSome believe to live is to endure, and in Ernest Hemingway s The Old Man and the Sea This idea is explored in a simplistic style of writing called Iceberg Theory, a style unique to Hemingway. In this powerful, yet simple novel Ernest Hemingway eloquently portrays the hardships of the average man. Old Man and the Sea is based on an old man named Santiago and his battle with a giant Marlin in the middle of the sea. The old man s experience with the marlin is one of misfortune, pride, and accomplishmentRead MoreThe Old Man and the Sea by Ernest Hemingway Essay983 Words   |  4 PagesThe Old Man and the Sea There is a scene in Ernest Hemingway’s The Old Man and the Sea, when after a shark has taken a big chunk about forty pounds off Santiago prize marlin catch, Santiago begin to doubt whether he should have gone out to sea and wishes that he had never hooked the fish and was alone in bed with his newspaper (103). Immediately after the Santiago says, â€Å"But man is not made for defeat a man can be destroyed but not defeated† (103). The life of Ernest Hemingway intertwines to theRead MoreRelationship Between The Old Man And The Sea And Ernest Hemingway1075 Words   |  5 Pagesthe author of The Old Man and The Sea, Ernest Hemingway. Gertrude, an American novelist, poet, playwright and art collector, served as a mentor for Ernest. The novelist also served as a godmother to Ernest along with her companion, Alice B. Toklas. Ernest Hemingway used his experience with Gertrude in his 1952 book, The Old Man and The Sea. Santiago and Manolin share a relationship similar to Ernest Hemingway and Gertrude Stein. Throughout The Old Man and The Sea, Ernest Hemingway provides many details

Faces of Whiteness Response Free Essays

Faces of Whiteness 2 Abstract The article â€Å"Faces of Whiteness: Pitfalls and the Critical Democratâ€Å" by John T. Warren and Kathy Hytten is an article that reviews what it means to be white. The article’s writers questioned how white students experienced diversity education information. We will write a custom essay sample on Faces of Whiteness Response or any similar topic only for you Order Now After reviewing the article, I was led to decide where I was in the proposed construct suggested by the article as a white student. The following is my reaction to the article and my best judgement on where I stand in regards to the construct presented.Faces of Whiteness 3 My reaction to this conceptual framework is that it makes an assumption that because a person is white, that they must present with one of these four temporary ‘faces’. I suppose my background and upbringing and family make-up make it very difficult to comprehend this. Since I was raised in a military family around other military families of all colors and I had a black uncle and a gay uncle, it is difficult to find out where I am in this transformative process. I don’t fit neatly into any of the four faces listed in the article.I would have to create my own face. One that was brought up to be a critical democrat already with a shade of missionary and a shade of intellectualizer. I was never really referred to as â€Å"white† in opposition to anyone until I came to American schools in the 8th grade. By then, I guess I was ignorant to differences in color. When it was presented to me that I was a white child with a nice house and that was a ‘problem’ if I chose to hang around other non-white or poor children, I suppose I would have to have categorized myself as a borderline intellectualizer.I do find â€Å"diversity education fascinating(Warren amp; Hytten, 2004)†, however, I did not keep a distance as the lecture suggests. I tended to become a borderline ‘missionary’ face then because I took a stand with those that would be discriminated against due to color or socioeconomic disadvantage. I was a rescuer. I remember getting into fights during my high school years defending other students who were picked on or deprived something due to whatever privilege they were ‘lacking’ according to other students, teac hers or even administrators. I did learn quickly to see that as a white child with a nice house in America, I was privy to things my friends were not and I chose to identify that fact and still make sure Faces of Whiteness 4 that my friends knew that it didn’t matter to me. I was always able to put myself in other peoples’ shoes. I still try to do this. It has helped me a lot in mediation of different struggles with self, students, parents, colleagues and administration. I suppose growing up military makes you into someone different.I know that my current peers do not always understand how I keep my cool and don’t let things bother my or I don’t let parents of my students’ get the better of me. I am able to place myself in their situation, mostly because I have probably been there. I have been placed in many different scenarios growing up. None of which I feel are appropriate to share here. Suffice it to say, I can adequately place myself in the shoes of almost anyone these days and identify with their worries and their needs. I think it is this that makes my â€Å"face of whiteness’ difficult to distinguish.I believe that I am currently a critical democrat in the making and doing pretty well so far. As for how I can apply this concept in my classroom: I myself can practice active listening in order to be aware of where my students are in this construct and to help them grow through their ‘faces’ and to a point of critical democracy and understanding. I will need to create activities that encourage students to engage in dialogue that brings out their viewpoints on color or other differences and provide them a safe place to learn to become the critical democrat and grow out of the other â€Å"faces of whiteness†. In addition, I can present information and ideas that promote discussion utilizing the Social Action Approach mentioned in our text. Or I could blend a couple of approaches mentioned. If I use the Social Action approach, I would better â€Å"enable students to identify important social issues, gather data related to them, clarify their values, make reflective Faces of Whiteness 5 decisions, and take actions to implement their decisionsâ€Å" (Banks amp; Banks, 2010). I could do this by presenting specific lesson plans that directly address the issue of prejudice and create opportunities for discussion, introspection and reflection.Using groups that are diverse to incorporate the lessons may provide the students more opportunity to see another point of view. It may also allow them to befriend each other, thus improving race relations in the classroom and in the school. Faces of Whiteness 6References Warren, J. T. , amp; Hytten, K. (2004). The faces of whiteness: pitfalls and the critical democrat. Communication Education, 53(4), 321-339. Banks , J. A. , amp; Banks, C. A. McGee. (Ed. ). (2010). Multicultural education; issues and perspectives, 7th ed. . Hoboken, NJ: John Wiley amp; Sons. How to cite Faces of Whiteness Response, Papers

Advanced Information Security

Question: Discuss about the Advanced Information Security. Answer: Yes, it is possible to get multiple certificates for the same domain signed by different CAs. If any send a request to two different Certificate Authority with the same key, then the sender received two different certificates for the same key. But the signature will be different for a different certificate. Browsers would treat them all as legitimate documents Installing software: The imposter could trick the user into thinking the user was fixing code written by Microsoft, but instead was installing malware. Sometimes user installs some software in their system, and some malware or molecules software also install this software. Viewing Web pages: For the web pages, the imposter could appeal off a phishing attack, tricking users into thinking that they were accessing their bank's Web site, and hence pull off a man-in-the-middle attack and gather login credentials. Moreover, they are accessing some personal data or putting some personal data on some website and hence pull off a man in the middle attack and collect all the personal details of this user. Why, in practice, are server certificates rarely signed: It appears to be too much trouble to distribute the public keys securely for the certificate authorities in advance and store them in the .ssh/authorized_keys directory of the client machines. The user wants to be sure that he or she has logged in to the machine that she is trying to log in to, especially if the authentication method is to send a password. Otherwise, an attacker could act as a man-in-the-middle. Rule conflicts is a problem in a firewall rule set. Some rules are created for rejecting all the packets from a particular destination. On the other hand, some rules are established to accept all the packets from a particular destination. If reject and accept destination are same then rule conflicts will be 2 TCP 55.66.77.0/24 Any 129.174.17/180 22 allow 3 TCP 55.66.77.12 4500 129.174.17/180 22 deny Occur. In this case, some rule conflicts are present which is given bellow: Above table shows that rule 2 allow all the packets from the destination IP address and destination port. Rule 3 indicates that all the packets are rejected from a particular destination where the destination of rule 2 and 3 is same. Therefore, a rule conflict occurs. 13 Any 0.0.0.0/0 Any 0.0.0.0/0 any allow 14 TCP 0.0.0.0/0 Any 0.0.0.0/0 any deny 15 UDP 0.0.0.0/0 Any 0.0.0.0/0 any deny In this case rule, 13 allow all the packets those are using any protocol. But in rule 14 and 15 shows that the packets are rejected those are using TCP and UDP protocol. Therefore, a rule conflict occurs. Redundancies 16 TCP 0.0.0.0/0 Any 129.57.17.180 6000:6010 deny 17 TCP 0.0.0.0/0 Any 129.174.17.180 0:1024 deny 18 Any 0.0.0.0/0 Any 129.174.17.180 any deny The FIRST match policy put on the first rule which match the packet. The BEST match policy put on the rule which is more accurate regarding the network. The LAST match policy put on the rule that is first. Mainly it is bottom to top. Proxy Firewall is one type of network security system which protects a network by filtering the packets. This firewall is used in an application layer. The proxy firewall allows all the network traffic by checking their validity. Proxy firewall is placed in the network gateway. All incoming packets are checked in the proxy server. If the packets are authorized then, proxy firewall grants the access. If not then proxy firewall destroy this packet. The transparent firewall acts as a gateway of a network. Mainly it is a routed hop. It is also called layer 2 firewalls which perform as a "bump in the wire" or a "stealth firewall." A transparent firewall has commonly used the firewall. The proxy filter firewall is extremely secure than the transparent firewall. The main difference between the transparent firewall and proxy firewall is proxy firewall use a proxy server in the system, but the transparent firewall is used routed hop firewall. NAT stand for Network Address Translation. NAT is applied in a single device as a network gateway. For an example router. A net enables router connect with the internet and hide the entire private from the public network. In NAT system, it is not necessary to recognize all the internal devices. All the generated request by workstation are sent via the router. NAT help the router to transfer this packets in the internet t destination. The NAT convert the source address of all packets and place its IP address. If security is to provide in to the NAT, the network will be more secure for the attackers. Mainly NAT create a firewall for the security purpose. All servers that are presented to people in the general system (web), including web servers and DNS servers ought to be set in the DMZ. The DMZ is a different subnet situated outside of the association's system, but at the same time secured by a firewall. Movement starting from the organization's system is permitted into the DMZ, however, activity from the DMZ is not allowed into the association's system. This is imperative since ought to a server get to be bargained, and an aggressor cannot access the organization's inside system. Bibliography Braun, J., Volk, F., Classen, J., Buchmann, J. and Mhlhuser, M., 2014. CA trust management for the Web PKI. Journal of Computer Security, 22(6), pp.913-959. Bray, R.F., Grzelak, C.P. and Keirstead, J.D., International Business Machines Corporation, 2015. Firewall event reduction for rule use counting. U.S. Patent 9,043,461. Carthern, C., Wilson, W., Bedwell, R. and Rivera, N., 2015. Network Address Translation and Dynamic Host Configuration Protocol. In Cisco Networks (pp. 255-272). Apress. Francis, P., 2015. Network Address Translation (NAT). ACM SIGCOMM Computer Communication Review, 45(2), pp.50-50. Ghai, S. and Verma, A., 2015. Network Security Using Divergent Firewall Technologies. IITM Journal of Information Technology, 1, p.29. Kachare, M.S.S. and Deshmukh, P., 2015. Firewall Policy Anomaly Management with Optimizing Rule Order. International Journal of Application or Innovation in Engineering Management (IJAIEM), 4(2), pp.201-205. Mao, H., Zhu, L. and Li, M., 2012, September. Current State and Future Development Trend of Firewall Technology. In Wireless Communications, Networking and Mobile Computing (WiCOM), 2012 8th International Conference on (pp. 1-4). IEEE. 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